last year I sent your github link to Tobias Hunger and he told me that's nice that someone is implementing a spellchecker for the qtcreator.
But he told me also that the style is not Qt conform.
To bring your plugin official to the qtcreator you have to add some extra work to style your code according to this style guide.http://qt-project.org/wiki/Qt_Coding_Style

I am very familiar with the mentioned Coding Style. When I started with my 3rd rewrite of the plugin I stopped following the style since at that time I did not think it would be something to be considered to become official (I was a bit demotivated and just wanted it to get out).